Fire alarm



FIG. 1 is a left view of our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof,

FIG. 4 is a top view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a perspective view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings are for purposes of illustrating portions of the design and form no part of the claimed design. 

CLAIM What is claimed is the ornamental design for a fire alarm, as shown and described. 